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Advanced Technical Reference

Sewing Technology

Industrial machines, needles, threads, attachments, stitch settings, seam performance, defects, and troubleshooting.

Sewing Technology
01

Machine Selection

Machine class and feeding system must match the stitch, seam, material behaviour, operation geometry, and quality requirement.

  • Use lockstitch for clean stable seams and chainstitch where elasticity is needed
  • Select overedge or safety stitch for edge control and joining
  • Use coverstitch or flatseam for extensible knit hems and seams
  • Choose drop, needle, differential, puller, or compound feed by material risk
  • Apply programmable pattern sewing for repeatable reinforcement
  • Document model, gauge, folder, feed, speed, and setting by operation
02

Needles, Threads & SPI

Needle point, size, thread construction, ticket, and stitch density form one engineered stitch system.

  • Use ball points for knits and sharp points for dense woven materials
  • Choose the smallest needle that forms a stable stitch without damage
  • Match thread strength, elongation, finish, colour, and heat resistance
  • Set SPI according to seam load, material strength, appearance, and extensibility
  • Avoid excessive SPI that perforates coated, leather, or delicate materials
  • Run sewability and seam-performance trials before bulk approval
03

Folders, Attachments & Settings

Guides and attachments improve consistency only when setup, feeding, and operator method are standardized.

  • Approve folder mouth, finished width, gauge, and seam allowance
  • Align feed dog, throat plate, presser foot, and needle position
  • Balance top, bobbin, and looper tensions without seam grinning
  • Set presser pressure and differential feed to prevent stretching or puckering
  • Control backtack, thread trimming, stitch count, and bartack dimensions
  • Lock approved settings and verify after style or material changes
04

Seam Performance & Standards

Sewn assemblies must satisfy appearance, strength, extensibility, slippage, and durability requirements.

  • Identify stitches with ISO 4915 and seams with ISO 4916
  • Test seam strength to ISO 13935 where applicable
  • Assess seam slippage to ISO 13936 for susceptible woven fabrics
  • Check seam extensibility before approving knit constructions
  • Verify torque, puckering, needle damage, and wash appearance
  • Reinforce stress points based on load path and product use
05

Defects & Troubleshooting

Systematic adjustment prevents recurring stitch defects and protects material from avoidable damage.

  • Skipped stitches: check needle system, point, clearance, timing, and threading
  • Thread breakage: check tension, guides, needle eye, heat, and abrasion
  • Puckering: balance feed, tension, SPI, thread, and differential shrinkage
  • Seam grin: improve bite, tension balance, seam allowance, or stitch class
  • Needle cuts: change point/size, reduce penetration damage, and inspect fabric
  • Record root cause, setting correction, trial result, and operator training
Apply buyer-specific manuals where requirements are stricter.

Author: Sanjeewa Dehiwalage — www.nosk.life© 2026 Sanjeewa Dehiwalage & NOSK.life. All rights reserved.